JP2005320885A - Dust seal in scroll fluid machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase corrosion resistance and always retain stable sealability by providing a back-up tube of a dust seal in a scroll fluid machine with a new structure back-up member replacing a conventional back-up tube in the back of or inside of a sliding member. <P>SOLUTION: The ring shaped sliding member 6 is fitted in an annular groove 12 provided on facing surfaces of a fixed scroll 17 and a revolving scroll 21 to surround both engagement parts via a flexible gripping ring 4 of an open U-shaped cross section gripping O-ring 3 from outside by both side pieces. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a dust seal in a scroll fluid machine such as a scroll compressor, a scroll vacuum pump, a scroll expander, and a scroll blower.

  For example, the fixed lap in the fixed scroll and the orbiting wrap in the orbiting scroll pivotally supported by the eccentric shaft are meshed, and the gas sucked from the outer peripheral portion is swung with a certain amount of eccentricity with the eccentric shaft. In a scroll fluid machine that pressurizes or depressurizes as it goes to the center, it is fixed to prevent leakage from the outer periphery of the scroll wrap and to prevent entry of dust and the like from the outside. An annular dust seal is provided between the part and the swivel part.

  For example, as shown by reference numeral (25) in FIG. 10, this dust seal is provided in an annular groove (24) provided on the contact surface of the fixed portion with the swivel portion so as to surround the swivel portion via a backup tube (26). The sliding member (27) is fitted.

  Specifically, referring to FIG. 10, a spiral fixed wrap (18) in a fixed scroll (17) having a suction port (15) in the outer peripheral portion and a discharge port (16) in the central portion, and a drive The end of the fixed scroll (17) at the outer periphery of the meshing part with the spiral orbiting wrap (22) in the orbiting scroll (21) that is eccentrically rotated with the eccentric shaft (20) integral with the shaft (19) An annular groove (24) is provided on the front surface of the plate (23), and a dust seal (25) for preventing leakage and intrusion of dust and the like is fitted into the annular groove (24).

  The dust seal (25) is configured, for example, by fitting a sliding member (27) through a backup tube (26) in an annular groove indicated by reference numeral (24) in FIG.

  As the sliding member (27), a self-lubricating material having low friction and heat resistance and wear resistance, for example, a slightly hard synthetic resin such as “Teflon” (trademark), or a metal is used, and the cross section is usually rectangular. ing.

  The backup tube (26) is an annular tube made of an elastic material having a sealing property such as silicon or fluorine rubber.

  If the dust seal backup tube in the scroll fluid machine is made of silicon, it has low corrosion resistance against chemicals and gases, etc., and if it is made of fluoro rubber, it is rich in corrosion resistance. There is a problem that it takes time and effort.

  In addition, regardless of the material of the backup tube, it is inevitable that the repulsive force decreases with use or over time, and the pressure contact force of the sliding member (27) against the mating member decreases. .

  In view of the above problems with the dust seal in the conventional scroll fluid machine, the present invention provides a backup member having a novel configuration, which replaces the conventional backup tube, on the back side, that is, on the inside of the sliding member. In addition to improving the performance, the stable sealing performance is always maintained, and the specific means is as follows.

(1) It has the flexibility of U-shaped cross-section with an O-ring sandwiched from the outside with both side pieces in an annular groove provided on the opposing surfaces of the fixed scroll and the orbiting scroll so as to surround the meshing part of both. A ring-shaped sliding member is fitted through the pinching ring.

(2) In the above item (1), both side pieces of the sandwiching ring face inward, that is, toward the bottom of the annular groove, and the inner ends of the both side pieces of the sandwiching ring and the O-ring are the bottom surface of the annular groove. Abut.

(3) In the above item (1) or (2), the inner ends of both side pieces of the support ring are brought into contact with the inner corners of the annular groove.

(4) In any one of the above items (1) to (3), the bases, which are the outer ends of both side pieces of the support ring, are connected to each other with a connecting piece, and the connecting piece is connected to the sliding member. It is in contact with the inner surface.

(5) In any one of the above items (1) to (3), the bases, which are the outer ends of both side pieces of the support ring, are connected by a connecting piece, and the connecting piece is connected to the sliding member. Bonded to the inner surface.

(6) In any one of the above items (1) to (5), a part of the connecting piece that connects the bases of the both side pieces of the support ring is fitted and locked to the inner surface of the sliding member.

(7) In any one of the above items (1) to (6), the connecting piece for connecting the bases of the both side pieces in the sandwich ring protrudes to the side beyond the both side pieces.

(8) In the above item (1), both side pieces of the support ring face outward, that is, the opening direction of the annular groove, and both side pieces and the O-ring of the support ring come into contact with the inner surface of the sliding member. ing.

(9) In any one of the above items (1) to (3), the two side pieces of the support ring are connected to each other by a connecting piece at the intermediate portion thereof, and an O-ring is held inside the connecting piece. Has been.

(10) In any one of the above items (1) to (5), the both side pieces of the support ring are connected to each other by connecting pieces at the intermediate portions in the inner and outer directions. An O-ring is held on the ring.

(11) In any one of the above items (1) to (5), the both side pieces of the support ring are connected to each other by a connecting piece at the middle portion thereof, and the O-ring is connected to the inside and outside of the connecting piece. Is held in the direction.

The effects of the invention described in each claim are as follows.
Claim 1: The sliding member is always in pressure contact with the end plate of the other orbiting scroll at an appropriate pressure, and an effective dust seal function is exhibited.

  Claim 2: When a strong pressure directed inward is applied to the sliding member, the repulsive force of the pinching ring becomes large, so that it does not cause malfunction.

  Claim 3: It is advantageous because the outward elastic projection output increases or decreases almost in proportion to the inward force acting on the sliding member.

  Claim 4:-Since the contact surface of a pinch ring and a sliding member becomes large, a pinch ring is hold | maintained stably.

  Claim 5: It is convenient because the sandwiching ring can be inserted into and removed from the annular groove integrally with the sliding member, and the sandwiching ring does not move laterally with respect to the sliding member.

  Claim 6: The clamping ring and the sliding member are reliably integrated.

  Claim 7: The lateral movement of the pinching ring in the annular groove is restricted.

  Claim 8: The insertion and removal of the O-ring with respect to the clamping ring is facilitated.

  Claim 9: The amount of bending in the inside / outside direction of the pinching ring becomes large, and the cushioning property of the sliding member becomes good.

  Claim 10: The same effect as that of Claim 9 can be achieved, and the O-ring can be easily attached and detached.

  Claim 11: The holding of the sliding member is ensured.

Best mode for carrying out the task

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments that are considered to be the best of the present invention described in each claim will be described below with reference to the drawings.
FIGS. 1-7 is a longitudinal cross-sectional view which shows the principal part of the dust seal in the scroll fluid machine based on this invention. In the following description, the bottom direction of the annular groove is inward and the opening direction is outward.

  FIG. 1 shows an embodiment of the invention described in claim 1 or 2. (1) is engraved so as to surround a meshing portion with an orbiting scroll (not shown) in an end plate (2) of a fixed scroll. An annular groove.

  An O-ring (3) is fitted to the bottom of the annular groove (1), and the O-ring (3) has a flexible cross-section with a U-shaped open leg facing inwardly fitted into the annular groove (1). It is clamped with both side pieces (5) and (5) of the clamp ring (4).

A ring-shaped sliding member (6) whose outer portion protrudes from the annular groove (1) is slidable inward and outward in the annular groove (1) outside the pinching ring (4). It is mated.
The O-ring (3) is a seamless one made of fluorine or the like.

  The sandwiching ring (4) is also made of a material having corrosion resistance such as fluorine and appropriate elasticity, and the thickness and inclination of the both side pieces (5) and (5) are the same as those of the O-ring (3) sandwiched between them. It is set so that it is elastically retained properly and does not break into a numbness during normal operation.

  The sliding member (6) is made of a corrosion-resistant material similar to a normal one, and may be a seamless member or a joint.

  Since the both side pieces (5) and (5) of the clamping ring (4) support the O-ring (3) in an elastic state, an elastic outward projecting force always acts on the clamping ring (4). The sliding member (6) is brought into sliding contact with the end plate of the other orbiting scroll with an appropriate pressure and functions as a dust seal.

  When an abnormally strong pressure directed inward is applied to the sliding member (6), both side pieces (5) and (5) of the support ring (4) bend outward as shown in FIG. Then, the tip of the elastic ring elastically presses the inner corner portion of the annular groove (1), so that the repulsive force of the pinching ring (4) becomes large, and the pinching ring (4) does not sag and does not malfunction.

  Therefore, a stable sealing performance is always maintained regardless of the protruding amount of the sliding member (6) from the annular groove (1).

  FIG. 3 shows an embodiment of the invention as set forth in claim 3. In the embodiment shown in FIG. 1, when the sliding member (6) is substantially in an unloaded state, The inner ends of the side pieces (5) and (5) are brought into contact with and locked to the inner corners of the annular groove (1).

  This is convenient because the outward elastic projection output increases or decreases in proportion to the inward force acting on the sliding member (6).

  1 to 3, the outer surface of the connecting piece (7) that connects the bases of the outer pieces (5) and (5) of the pivot ring (4) is simply applied to the inner surface of the sliding member (6). They may be in contact with each other (Claim 4), but may be bonded together (Claim 5).

  Further, as shown in FIG. 4, an engaging piece (8) having the same width as that of the connecting piece (7) of the sandwiching ring (4) or a narrower width than the connecting piece (7) is projected. It may be fitted into an annular engagement groove (9) provided on the inner surface of the moving member (6), or may be adhered to the engagement groove (9) with an adhesive.

  FIG. 5 shows an embodiment of the invention as set forth in claim 7, and in the same supporting ring (4) as shown in FIGS. 1 and 3, both side pieces (5) (5 The connecting piece (7) for connecting the bases of the two) protrudes beyond both the side pieces (5) and (5).

  In this way, the contact surface between the sliding member (6) and the sandwiching ring (4) becomes large, the stability of the connection between them is improved, and the annular groove (1) of the sandwiching ring (4) is improved. Since the lateral movement of the O-ring is restricted, the holding of the O-ring (3) is also stabilized.

  FIG. 6 shows an embodiment of the invention as set forth in claim 8, wherein both side pieces (5) and (5) of the support ring (4) face outward, and the outside of these both side pieces (5) and (5). The end and the O-ring (3) supported between the ends are in contact with the inner surface of the sliding member (6).

  In this way, after inserting the support ring (4) into the annular groove (1), the O-ring (3) can be inserted and removed from the outside between the both side pieces (5) and (5). This is convenient for exchanging the O-ring (3).

  FIG. 7 shows an embodiment of the invention as set forth in claim 9, wherein the side pieces (5) and (5) of the pinching ring (4) are connected to each other by a connecting piece (7) in the middle part thereof, and the connecting piece On the inner side of (7), an O-ring (3) is held between both side pieces (5) and (5).

  If it does in this way, the outward protrusion elastic force of the sliding member (6) by a pinching ring (4) can be set to wide range.

  FIG. 8 shows an embodiment of the invention as set forth in claim 10, wherein both side pieces (5) and (5) of the pinching ring (4) are connected by intermediate connecting portions (7) between the inner and outer directions. On the outside of the connecting piece (7), an O-ring (3) is fitted between both side pieces (5) and (5) of the pivot ring (4).

  FIG. 9 shows an embodiment of the invention as set forth in claim 11, in the inside and outside of the connecting piece (7) that connects the inner and outer intermediate portions of both sides (5) and (5) of the pivot ring (4). An O-ring (3) is fitted between the side pieces (5) and (5) of the sandwiching ring (4).

It is a principal part longitudinal cross-sectional view which shows embodiment of the invention of Claim 1 or 2. In the thing of FIG. 1, it is a figure which shows the state in which the pressing force which faces inward acts on the sliding member. It is a figure similar to FIG. 1 which shows embodiment of the invention of Claims 3-5. It is a figure similar to FIG. 1 which shows embodiment of the invention of Claim 6. It is a figure similar to FIG. 1 which shows embodiment of the invention of Claim 7. It is a figure similar to FIG. 1 which shows embodiment of the invention of Claim 8. It is the same figure as FIG. 1 which shows embodiment of the invention of Claim 9. It is a figure similar to FIG. 1 which shows embodiment of the invention of Claim 10. It is a figure similar to FIG. 1 which shows embodiment of the invention of Claim 11. 1 is a longitudinal side view schematically illustrating a typical scroll fluid machine. FIG. 11 is an enlarged longitudinal sectional view schematically showing a dust seal in the scroll fluid machine shown in FIG. 10.

Explanation of symbols

(1) Annular groove
(2) End plate
(3) O-ring
(4) Clamp ring
(5) Side piece
(6) Sliding member
(7) Connecting piece
(8) Engagement piece
(9) Annular engagement groove
(15) Suction port
(16) Discharge port
(17) Fixed scroll
(18) Fixed wrap
(19) Drive shaft
(20) Eccentric shaft
(21) Orbiting scroll
(22) Swivel lap
(23) End plate
(24) Annular groove
(25) Dust seal
(26) Backup tube
(27) Sliding member

Claims (11)

  A flexible support ring having a U-shaped cross-section with an O-ring sandwiched from both sides in an annular groove provided on opposite surfaces of the fixed scroll and the orbiting scroll so as to surround the engaging portion of both. A dust seal in a scroll fluid machine, wherein a ring-shaped sliding member is fitted via   The both side pieces of the sandwiching ring are directed inward, that is, toward the bottom of the annular groove, and the inner ends of the both side pieces of the sandwiching ring and the O-ring are in contact with the bottom surface of the annular groove. The dust seal in the scroll fluid machine according to claim 1.   The dust seal in the scroll fluid machine according to claim 1 or 2, wherein inner ends of both side pieces of the sandwiching ring are brought into contact with inner corners of the annular groove.   The base parts which are the outer ends of the both side pieces of the sandwiching ring are connected with connecting pieces, and the connecting pieces are in contact with the inner surface of the sliding member. The dust seal in the scroll fluid machine in any one.   The bases which are the outer ends of the both side pieces of the sandwiching ring are connected with connecting pieces, and the connecting pieces are bonded to the inner surface of the sliding member. Dust seal in scroll fluid machinery.   The scroll fluid machine according to any one of claims 1 to 5, wherein a part of the connecting piece for connecting the base portions of the both side pieces of the sandwiching ring is fitted and locked to the inner surface of the sliding member. Dust seal in.   The dust seal in the scroll fluid machine according to any one of claims 1 to 6, wherein the connecting piece for connecting the base portions of the both side pieces in the sandwich ring protrudes to the side beyond the both side pieces.   The both side pieces of the sandwiching ring face outward, that is, the opening direction of the annular groove, and the both side pieces and O-ring of the sandwiching ring are in contact with the inner surface of the sliding member. A dust seal in the scroll fluid machine described.   The both side pieces of the sandwiching ring are connected to each other by connecting pieces at intermediate portions thereof, and an O-ring is held inside the connecting piece. A dust seal in the scroll fluid machine described.   The both side pieces of the sandwiching ring are connected to each other by connecting pieces at intermediate portions in the inner and outer directions, and an O-ring is held on the sandwiching ring outside the connecting pieces. The dust seal in the scroll fluid machine in any one of -5. The both side pieces of the sandwiching ring are connected to each other by a connecting piece at their intermediate portions, and the O-ring is held inside and outside the connecting piece. The dust seal in the scroll fluid machine in any one.

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